Some regularities of fecundity in animals

The dependence of descendants’ weight on the weight of females in invertebrates and vertebrates can be described by equations of the power function with an exponent close to unity. The specific fecundity of animals decreases with increasing weight in females. A concept of the fecundity rate as the number of offspring produced by one female per year and the fecundity rate coefficient as the fecundity of a female with a weight of 1 g per year are proposed. The fecundity coefficient value is reduced in the course of evolution.